Long Answer TypeWhat are the steps involved in formation of root nodule
Steps of root nodules :
(1) Rhizobium bacteria makes contact with a susceptible root hair and divide near it.
(2) After successful infection of the root hair causes the root hair curls,
(3) Infected thread carries the bacteria to the inner cortex. The bacteria modifies into rod-shaped bacteroids and cause inner cortical and pericycle cells to divide. Division and growth of cortical and pericycle cells lead to the nodule formation,
(4) A mature nodule forms with vascular tissues continuous with those of the root.
One Word AnswersLong Answer Type
Multiple Choice QuestionsIn which of the following, all three are macronutrients
Iron, copper, molybdenum
Molybdenum, magnesium, manganese
Nitrogen, nickel, phosphorous
Nitrogen, nickel, phosphorous
The first stable product of fixation of atmospheric nitrogen in leguminous plants is
NO2-
ammonia
NO3-
NO3-
During biological nitrogen fixation inactivation of nitrogenase by oxygen poisoning is prevented by
Leghaemogolobin
Xanthophyll
Carotene
Carotene
Best defined function of manganese in green plants is
Photolysis of water
Calvin cycle
Nitrogen fixation
Nitrogen fixation
Consumption of which one of the following foods can prevent the kind of blindness associated with vitamin ‘A’ deficiency?
‘Flaver Savr’ tomato
Canolla
Golden rice
Golden rice
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